> Don't ever use towels on either frames or glasses.
Maybe because I get the non-scratch coating, but this has never been an issue for me. Have been doing it for twenty years without issue. Assuming lenses are replaced every several years, which they should be.
The scratches on the glass do not have to be visible. The surface just gets a tiny bit matte, reducing the contrast and also making cleaning a bit bigger problem.
As to the frames, except for the unavoidable wear and tear in places where it can't be avoided, my current main daily driver Tom Ford acetate glasses look as shiny as on the day I got them, 3 years ago.
My friend has similar frames and they look matte, after less than a year.
Titanium frame is my latest love iteration of my glasses. It makes them more light. I've found that's what I find annoying about glasses, the weight on my head. Not the peripheral. In fact, I've tried lenses various times, and never have been able to go with it. Too much discomfort.
I would like to add: the weight on my nose is more discomforting than grease on my glasses. I sometimes clean my glasses and I'm afterwards like wow, that was dirty. But did it really bother me? Not really. I rather do it for other people, cause it makes me look better, but such isn't a high prio for me (already 'married with children').
Maybe because I get the non-scratch coating, but this has never been an issue for me. Have been doing it for twenty years without issue. Assuming lenses are replaced every several years, which they should be.